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Technical Details

Hupigon variants are backdoor programs, which provide an attacker with access to, and control of, an infected machine. There are a large number of variants in the Hupigon family.

The backdoor's file is a PE executable. The file may be packed with UPX. Unpacked, the code size is 710kB. It is very rare for a Hupigon variant to be smaller than 299kB.

Hupigons are written with Borland Delphi.

The following text strings can typically be found in a Hupigon variant:

6600.org

BEI_ZHU

GrayPigeon

Hacker.com.cn.exe

huaihuaitudou

Rejoice2007

woainisisi

Installation

When the backdoor's file is started, it copies itself as a file named something similar to "Hacker.com.cn.exe" in the Windows System folder and then uses the following processes to make itself to look like a valid Windows program:

calc.exe

cmd.exe

mmc.exe

mspaint.exe

mstsc.exe

notepad.exe

osk.exe

sndrec.exe

sndvol32.exe

svchost.exe

winchat.exe

It also makes a number of additions to the registry.

Activity

Hupigon variants have several different types of features. The following list is an example of some:

It allows others to access the computer

Allows for recording with the user's webcam

Can make the user's computer to attack various servers

Send victim's computer messages

Has rootkit functionality so it has a stealth component that hides files

Create logs from keystrokes, steals passwords, and sends this information to remote servers

Propagation

Hupigon doesn't have any automatic mechanisms to spread itself. It must be sent by its author via email, through a website, or even via Instant Messengers (IM) such as Yahoo, MSN, ICQ, and Skype.

Creating Hupigon Variants

Hupigon variants are created using kit software. The kit is maintained in a very professional fashion with a highly developed User Interface (UI).

The main UI of the kit can be seen below:

Many options can be set. The "Fast Configuration" shown below enable the following options:

Service name is rejoice44.exe

Installation path is Msinfo&hellip;

Password is 1234

Icon is taken from MS Media Player

Uses Internet Explorer to bypass firewall

Create mutex and remove installer from installer folder

Pack code by using UPX

Self/auto-clone protected installation path is "system32"

Executable is calc.exe

There is also a "rootkit" option available. Other options including adding a URL to target for a Distributed Denial of Service (DDoS) attack:

The kit as default settings to create mutexes. Many Hupigon variants therefore create mutexes in the following format: